1961. First Edition. 107 pages. No dust jacket. This is an ex-Library book. Blue cloth with gilt lettering to spine. Contains black and white diagrams throughout. Expected library inserts, stamps and inscriptions. Pages remain bright and clear. Binding is firm. Small tear to page 107. Pen marks to title page and page facing it. Boards have light shelf-wear, with minor corner bumping and minimal scuffing to edges. Spine and edges are moderately sunned, with mild crushing to ends. Gilt remains bright. Label to front board. Light rubbing and scuffing overall, with some noticeable marking also.